Breast pump



FIG. 1 is a front, right, and top perspective view of a breast pump, showing my new design;

FIG. 2 is rear, left, and bottom perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left elevational view thereof;

FIG. 6 is a right elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is an exploded view thereof.

The broken lines depict portions of the breast pump that form no part of the claimed design. 

CLAIM The ornamental design for a breast pump, as shown and described. 